Exchange Of Spies Was Critical To U.S.-Cuba Deal

Part of the deal for the return of American Alan Gross from Cuba involved the release of a Cuban man who had served as a spy for the U.S. According to officials with the intelligence community, the man provided key tips that led to the discovery of Cuban espionage against the U.S. He had been held in prison by Cuban for some 20 years until this week's deal.

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